what is the real reason beavers build damms?
i read somewhere that its because they dont like the noise of running water so they try to cover up the sound. but most places say its cuz theyr environmentally conscious.
whats the real reason??

I found this page which indicates that they do not like the noise of running water.

http://www.naturealmanac.com/archive/beaver_dams/beaver_dams.html

They live in lodges built out in the water, where the entrance is underwater. This is their protection against predators. It is not all that easy to find the exact type of pond they need, so they just make it, by damming a stream to deepen the water upstream.
If they do, indeed, dislike the noise of running water, I suspect it would be a consequence of their need for deeper, still, water, rather than a cause of it.

Far from being environmentally concious (how could an animal be that?) they are very destructive. The dam goes it is easy for them to build it, not where it would do the most good for any other life forms. Many trees are killed by beaver ponds, as they are flooded out.

Are they easy seen in the wild, Agony, or are the the reclusive type?

They do tend to be more on the reclusive side, and any in the wild are quite far away from the built-up metropolitan areas.
When we were out in New Brunswick a couple of years ago, we visited a spot where a boardwalk had been built near a dam, in Fundy National Park. There was one beaver who spent quite a lot of time eating quite close to us, and his apparent lack of concern for our presence surprised me. Then I realized that there were 2 or 3 younger beavers eating at the other end of the pond, and this older fellow was distracting us from the youngsters. It was very cool and the best viewing of beavers that I've ever had.
We went back the next night but none of them were out that time.

It depends on where you spend your time in the wild, really. I pass two lodges every time I go to the city - they are within 50 meters or so of the highway.
That's fairly unusual, though. You won't see many of them in built up areas because farmers don't want them on their land, because of the damage they do. They tend to be controlled in national parks, too, for the same reason (they trap them and move them to a place where they won't do much harm). I used to live about two and a half hours north of where I am now, where it was mostly bush, and beavers were common. You are more likely to see signs of them than see the actual animals, but they're not too shy. If you sit quietly near shore in an area where they are, you'll see them, eventually.
Where skunkee is, in Southern Ontario, beavers would be pretty rare, but I live in emptier country. She can see raccoons, though, which you never see here.

Yes indeed we have lots of raccoons in these parts! Some of them are as bold as brass.